| Budget Amount *help |
¥16,770,000 (Direct Cost: ¥12,900,000、Indirect Cost: ¥3,870,000)
Fiscal Year 2016: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2015: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2014: ¥8,970,000 (Direct Cost: ¥6,900,000、Indirect Cost: ¥2,070,000)
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| Outline of Final Research Achievements |
The fatigue life of CFRP is well improved by modifying the polymer matrix with nano fibers such as Cellulose Nano Fibers due to an increase of observed adhesive strength between carbon fiber (CF) and polymer matrix. When nano fibers (NF) are well dispersed in the matrix, the physical modification of matrix becomes significant while they stick on CF, their effect disappears. NF must be enough longer to slide across two adjacent fibers. If nano fibers stick on the CF surface, the physical modification effect does not happen. Plastic deformation due to nano/micro crazing is induced at NF ends. Stress concentration at the CF/matrix interface becomes low. Then, fatigue life is extended.
UD prepreg was successfully developed using loosed fiber tows. CF-SMC using vinylester was also developed using sub-micron glass fibers whose mechanical properties are greater than those of commercially available CF-SMC. The applicability of nano fibers was also demonstrated using PP matrix for CFRTP.
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